initial Raspberry Vanilla AOSP 12 commit

* Audio
  - Based on AOSP hikey audio HAL:
    https://android.googlesource.com/device/linaro/hikey/+/refs/heads/master/audio/
  - ALSA based on Android-x86
  - ALSA loop is used to support HDMI audio on Pi 4 because VC4 HDMI
    audio devices use SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE that is not
    supported on Android
    https://github.com/raspberrypi/linux/issues/4651
    https://github.com/raspberrypi/linux/issues/4654

* Bluetooth
  - AOSP Broadcom vendor stack with some additional fixes from android-rpi

* Camera
  - libcamera for official Raspberry Pi CSI camera modules based on GloDroid
  - AOSP external camera HAL for UVC USB webcams:
    https://source.android.com/docs/core/camera/external-usb-cameras

* Graphics
  - OpenGL & Vulkan: upstream Mesa with GloDroid patches
  - Upstream drm_hwcomposer with force resolution patch from Android-x86 and
    my additional fixes
  - minigbm based on GloDroid

* Health
  - Based on AOSP cuttlefish health HAL

* Kernel
  - Merge of Raspberry Pi and AOSP common kernel with my additional fixes
    and configurations
    https://github.com/raspberrypi/linux
    https://android.googlesource.com/kernel/common/

* Lights
  - Based on LineageOS Xiaomi msm8996-common lights HAL

* suspend_blocker
  - Based on AOSP cuttlefish

* v4l2_codec2
  - Based on AOSP with my Raspberry Pi 4 specific fixes

* Wifi
  - AOSP Broadcom vendor stack with my additional fixes

light/Light.cpp

@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2018 The LineageOS Project
+ * Copyright (C) 2021-2022 KonstaKANG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "LightService"
+
+#include "Light.h"
+
+#include <android-base/logging.h>
+
+namespace {
+using android::hardware::light::V2_0::LightState;
+
+static constexpr int DEFAULT_MAX_BRIGHTNESS = 255;
+
+static uint32_t rgbToBrightness(const LightState& state) {
+    uint32_t color = state.color & 0x00ffffff;
+    return ((77 * ((color >> 16) & 0xff)) + (150 * ((color >> 8) & 0xff)) +
+            (29 * (color & 0xff))) >> 8;
+}
+}  // anonymous namespace
+
+namespace android {
+namespace hardware {
+namespace light {
+namespace V2_0 {
+namespace implementation {
+
+Light::Light(std::pair<std::ofstream, uint32_t>&& lcd_backlight)
+    : mLcdBacklight(std::move(lcd_backlight)) {
+    auto backlightFn(std::bind(&Light::setLcdBacklight, this, std::placeholders::_1));
+    mLights.emplace(std::make_pair(Type::BACKLIGHT, backlightFn));
+}
+
+// Methods from ::android::hardware::light::V2_0::ILight follow.
+Return<Status> Light::setLight(Type type, const LightState& state) {
+    auto it = mLights.find(type);
+
+    if (it == mLights.end()) {
+        return Status::LIGHT_NOT_SUPPORTED;
+    }
+
+    it->second(state);
+
+    return Status::SUCCESS;
+}
+
+Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
+    std::vector<Type> types;
+
+    for (auto const& light : mLights) {
+        types.push_back(light.first);
+    }
+
+    _hidl_cb(types);
+
+    return Void();
+}
+
+void Light::setLcdBacklight(const LightState& state) {
+    std::lock_guard<std::mutex> lock(mLock);
+
+    uint32_t brightness = rgbToBrightness(state);
+
+    // If max panel brightness is not the default (255),
+    // apply linear scaling across the accepted range.
+    if (mLcdBacklight.second != DEFAULT_MAX_BRIGHTNESS) {
+        int old_brightness = brightness;
+        brightness = brightness * mLcdBacklight.second / DEFAULT_MAX_BRIGHTNESS;
+        LOG(VERBOSE) << "scaling brightness " << old_brightness << " => " << brightness;
+    }
+
+    mLcdBacklight.first << brightness << std::endl;
+}
+
+}  // namespace implementation
+}  // namespace V2_0
+}  // namespace light
+}  // namespace hardware
+}  // namespace android